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Let `x, y and z` be positive real numbers such that `x^(log_2 7) = 8, y^(log_3 5) = 81 and z^(log_5 216) = (5)^(1/3)`.The value of `(x (log_2 7)^2) + (y^(log_3 5)^2) + z^((log_5 216)^2)`, is

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